lower gas costs on mainnet

Author: brentstone

Cargo.lock

@@ -8,7 +8,7 @@ members = [
     "phase5a",
     "phase5b",
     "increase_target_staked_ratio",
-    "update-tx-claim-rewards",
+    "update-tx-claim-rewards", "update-gas-costs",
 ]
 
 default-members = [

Cargo.toml

@@ -18,7 +18,7 @@ source:
   COPY --keep-ts Cargo.toml Cargo.lock ./
   COPY --keep-ts --chmod 755 docker/run-wasmopt.sh ./run-wasmopt.sh
   COPY --keep-ts --chmod 755 docker/download-wasmopt.sh ./download-wasmopt.sh
-  COPY --keep-ts --dir phase2 phase3 phase4 phase5a phase5b increase_target_staked_ratio update-tx-claim-rewards ./
+  COPY --keep-ts --dir phase2 phase3 phase4 phase5a phase5b increase_target_staked_ratio update-tx-claim-rewards update-gas-costs ./
 
 # lint runs cargo clippy on the source code
 lint:

Earthfile

@@ -0,0 +1,16 @@
+[package]
+name = "update-gas-costs"
+description = "WASM transaction to write minimum gas costs for desired tokens."
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+version.workspace = true
+
+[dependencies]
+namada_tx_prelude.workspace = true
+rlsf.workspace = true
+getrandom.workspace = true
+
+[lib]
+crate-type = ["cdylib"]
+

update-gas-costs/Cargo.toml

@@ -0,0 +1,64 @@
+use std::collections::BTreeMap;
+
+use namada_tx_prelude::*;
+
+pub type ChannelId = &'static str;
+pub type BaseToken = &'static str;
+
+pub type Gas = token::Amount;
+pub type MinimumGasPrice = Gas;
+
+const IBC_TOKENS: [(ChannelId, BaseToken, MinimumGasPrice); 6] = [
+    (
+        "channel-0",
+        "stuosmo",
+        Gas::from_u64(3), // 3 stuosmo / gas unit
+    ),
+    (
+        "channel-1",
+        "uosmo",
+        Gas::from_u64(3), // 3 uosmo / gas unit
+    ),
+    (
+        "channel-4",
+        "upenumbra",
+        Gas::from_u64(3), // 3 upenumbra / gas unit;
+    ),
+    (
+        "channel-5",
+        "uusdc",
+        Gas::from_u64(1), // 1 uusdc / gas unit;
+    ),
+    (
+        "channel-6",
+        "unym",
+        Gas::from_u64(15), // 15 unym / gas unit;
+    ),
+    (
+        "channel-7",
+        "untrn",
+        Gas::from_u64(7), // 7 untrn / gas unit;
+    ),
+];
+
+#[transaction]
+fn apply_tx(ctx: &mut Ctx, _tx_data: BatchedTx) -> TxResult {
+    // Read the current gas cost map
+    let gas_cost_key = get_gas_cost_key();
+    let mut minimum_gas_price: BTreeMap<Address, token::Amount> =
+        ctx.read(&gas_cost_key)?.unwrap_or_default();
+
+    // Enable IBC deposit/withdraws limits
+    for (channel_id, base_token, can_be_used_as_gas) in IBC_TOKENS {
+        let ibc_denom = format!("transfer/{channel_id}/{base_token}");
+        let token_address = ibc::ibc_token(&ibc_denom).clone();
+
+        // Check if this ibc token should can also be used to pay for gas
+        minimum_gas_price.insert(token_address.clone(), gas);
+    }
+
+    // Write the gas cost map back to storage
+    ctx.write(&gas_cost_key, minimum_gas_price)?;
+
+    Ok(())
+}